Good point. That got me in trouble a few months back at Mt. Rogers, VA. I let my considerably-younger, ex-SEAL buddy set up the hike. While he did not force me to try to keep up with him during the day (in fact, quite the opposite - he slowed down and was very encouraging), I tried to force myself to go faster, because I felt I was holding him back. I also felt under pressure simply because he set - and I agreed to (very important point) - daily mileage goals that were 25 - 30% higher than I usually am comfortable with (and 50% lower than his usual.) I wouldn't have made the daily goal at my pace, so I forced myself to pick it up - and ended up leaving the trail halfway through the trip. (At least I did the pretty half of the trip.)

So, there are two parts to HYOH: hike at your own pace, and make sure the daily goals (those campsites where you catch up) are within your daily range.